Rzr virgin with virgin questions

The best wifey in the world just got me my first rzr xp 1000. I’ve had several quads in the past but never a side x side. So if you all can school me on the dos and don’ts of it that would be awesom. Also do these things come with a parking brake? Should i use hi or low gear when I’m riding? When should I use awd? We can talk about maintenance later when I get there it only has 2 miles. Oh and where do I go to buy accessories both for me and the rzr? Sorry for the newb questions and if it helps it’s a 2015 model. Thanks in advance guys I look forward to being part of this awesome community